1 files changed, 24 insertions, 0 deletions
diff --git a/src/test/ui/traits/object/bounds-cycle-1.rs b/src/test/ui/traits/object/bounds-cycle-1.rs
new file mode 100644
index 000000000..314676492
--- /dev/null
+++ b/src/test/ui/traits/object/bounds-cycle-1.rs
@@ -0,0 +1,24 @@
+// Check that we don't have a cycle when we try to normalize `Self::U` in the
+// bound below.
+
+// check-pass
+
+trait Is {
+    type T;
+}
+
+impl<U> Is for U {
+    type T = U;
+}
+
+trait Obj {
+    type U: Is<T = Self::U>;
+}
+
+fn is_obj<T: ?Sized + Obj>(_: &T) {}
+
+fn f(x: &dyn Obj<U = i32>) {
+    is_obj(x)
+}
+
+fn main() {}